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From:   Luiz Augusto von Dentz <luiz.dentz@gmail.com>
To:     linux-bluetooth@vger.kernel.org
Subject: [PATCH v4] Bluetooth: hci_event: Fix parsing of CIS Established Event
Date:   Thu, 22 Jun 2023 12:27:22 -0700
Message-Id: <20230622192722.1248374-1-luiz.dentz@gmail.com>
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From: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>

The ISO Interval on CIS Established Event uses 1.25 ms slots:

    BLUETOOTH CORE SPECIFICATION Version 5.3 | Vol 4, Part E
    page 2304:

      Time = N * 1.25 ms

In addition to that this always update the QoS settings based on CIS
Established Event.

Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
---
 net/bluetooth/hci_event.c | 36 +++++++++++++++++++++++-------------
 1 file changed, 23 insertions(+), 13 deletions(-)

diff --git a/net/bluetooth/hci_event.c b/net/bluetooth/hci_event.c
index b1aefe4bb751..049aa7f6a7c5 100644
--- a/net/bluetooth/hci_event.c
+++ b/net/bluetooth/hci_event.c
@@ -6822,6 +6822,7 @@ static void hci_le_cis_estabilished_evt(struct hci_dev *hdev, void *data,
 {
 	struct hci_evt_le_cis_established *ev = data;
 	struct hci_conn *conn;
+	struct bt_iso_qos *qos;
 	bool pending = false;
 	u16 handle = __le16_to_cpu(ev->handle);
 
@@ -6846,21 +6847,30 @@ static void hci_le_cis_estabilished_evt(struct hci_dev *hdev, void *data,
 
 	pending = test_and_clear_bit(HCI_CONN_CREATE_CIS, &conn->flags);
 
-	if (conn->role == HCI_ROLE_SLAVE) {
-		__le32 interval;
+	qos = &conn->iso_qos;
 
-		memset(&interval, 0, sizeof(interval));
+	/* Convert ISO Interval (1.25 ms slots) to latency (ms) */
+	qos->ucast.in.latency = DIV_ROUND_CLOSEST(le16_to_cpu(ev->interval) *
+						  125, 100);
+	qos->ucast.out.latency = qos->ucast.in.latency;
 
-		memcpy(&interval, ev->c_latency, sizeof(ev->c_latency));
-		conn->iso_qos.ucast.in.interval = le32_to_cpu(interval);
-		memcpy(&interval, ev->p_latency, sizeof(ev->p_latency));
-		conn->iso_qos.ucast.out.interval = le32_to_cpu(interval);
-		conn->iso_qos.ucast.in.latency = le16_to_cpu(ev->interval);
-		conn->iso_qos.ucast.out.latency = le16_to_cpu(ev->interval);
-		conn->iso_qos.ucast.in.sdu = le16_to_cpu(ev->c_mtu);
-		conn->iso_qos.ucast.out.sdu = le16_to_cpu(ev->p_mtu);
-		conn->iso_qos.ucast.in.phy = ev->c_phy;
-		conn->iso_qos.ucast.out.phy = ev->p_phy;
+	switch (conn->role) {
+	case HCI_ROLE_SLAVE:
+		qos->ucast.in.interval = get_unaligned_le24(ev->c_latency);
+		qos->ucast.out.interval = get_unaligned_le24(ev->p_latency);
+		qos->ucast.in.sdu = le16_to_cpu(ev->c_mtu);
+		qos->ucast.out.sdu = le16_to_cpu(ev->p_mtu);
+		qos->ucast.in.phy = ev->c_phy;
+		qos->ucast.out.phy = ev->p_phy;
+		break;
+	case HCI_ROLE_MASTER:
+		qos->ucast.out.interval = get_unaligned_le24(ev->c_latency);
+		qos->ucast.in.interval = get_unaligned_le24(ev->p_latency);
+		qos->ucast.out.sdu = le16_to_cpu(ev->c_mtu);
+		qos->ucast.in.sdu = le16_to_cpu(ev->p_mtu);
+		qos->ucast.out.phy = ev->c_phy;
+		qos->ucast.in.phy = ev->p_phy;
+		break;
 	}
 
 	if (!ev->status) {
-- 
2.40.1